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Ursa Astronomical Association

Sun - 15.4.2021 at 15.43 Espoo Observation number 97680

Visibility II / V

Tommi Ropponen, Ursa (Etelä-Suomi)

The sun photographed through the gauze, on the surface of which the active region AR2814 is visible. Visibility was poor when there was something thin cloud gauze in front of the puck all the time. I lived up to better hopes for this active area, but the weather was not favorable now. A little more detail could be excavated from the black and white image to be seen with the naked eye.

Due to the weather, only 10% of the image stack could be stacked when the material was so weak. Generally, the corresponding stack contains 30-40% of the images.

Additional information
  • Observation target
    • Sun
    • Heikosti näkyvä
  • Seeing
    • Bad
Technical information

Sony A7iii / SEL TC20 / SEL200600G / Baader AstroSolar membrane. Scopetech Mount Zero / Leofoto LS-364C. 1/400 s, iso 250, f / 18, 1200 mm. 792 raw images taken with serial fire in APS-C body mode using an electronic shutter. The best 10% of the images in the processed stack. Processing includes Lightroom, Pipp, Autostakkert3, ImPPG and colors in Photoshop.

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